Sand molding-machine



(No Modevzl.)

A RICE.

SAND MOLDING MACHINE.

Patented Apr. .20, 1886.

Aw' .dttomey UNITED STATES PATENT CEEICE.

ARTHUR RICE, OF NFV ALBANY, INDIANA, ASSIGNOR 'lO THE PEERLESSMANUFACTURING CONIPA NY, OF LOUISVILLE, KENTUCKY.

SAND MoLDlNG-MAol-HNE.

SPECIFICATION forming part of Letters Patent No. 340,362, dated April20, 1886.

Application tiled January 20, 18H5. Serial No. M9132. (No model.)

T 0 all whom, it 12m/ 1j concern.-

Be it known that I, ARTHUR RICE, a citizen of the United States,residing at New Albany,in

the county of Floyd and State of Indiana, have I,

ing out it will strike the bridge and bring it invented certain new anduseful Improvements in Sand Molding-Machines, of which the following isa full, clear, and exact description.

This invention relates to certain improvements in that class of'machines for making g molds for casting represented in United StatesLetters Patent Nos. 322,202, granted July 14, 1885, and 332,834, grantedDecember 22, 1885.

The improvements consist in the drawer for filling the mold w-ith sand,and means for operating the said drawer, and means for venting theflask, all as l will now proceed to particularly set forth and claim.

In the accompanying drawings, in the sev` eral figures of which likeparts are similarly designated, Figure 1 is a side elevation, partly insection, of one form of' my invention. Fig. 2 is a similar View ofanother form; Fig. 3, a cross-section in the plane of' line a' x ot Fig.2 on a larger scale; and Fig. 4 is a bottom View of the binder onanother scale.

The sand-hopper a, its supporting-frame b, and the molding-machine c maybe of any preferable construction. The bottom of the sand-hopper isprovided with a chamber, in which is arranged the sand-drawer d in sucha manner that such drawer constitutes a movable bottom for the hopper,substantially as in my Patent No. 332,834.

The drawer d is preferably of metal, and along the upper edge of eachside it is provided with a flange, e, projecting outwardly at rightangles from the same, by means of which flanges e e the drawer issupported and movable upon rollers f, secured to the frame b. The draweris divided into two compartments, and in the form shown in Fig. l thefront compartment, g, is bottomless and receives the sand from thehopper, and conveysit to and deposits it in the flask on themolding-machine. The rear compartment, h, in all cases has a closed top,li, which serves as a valve to shut off the escape of sand from thehopper when the drawer is projected over the flask.

In Fig. l the bridge] is hung in brackets 7c between the hopper and themolding-machine, and said bridge is of a width to span the space betweenthe hopper and molding-machine.

Said bridge is weighted or otherwise constructed to stand upright, andis in this position so near to the hopper that when the front end of thedrawer clears the hopper in movinto a horizontal posit-ion to cover thespace between the hopper and molding-machine, and thus aid thecompartment g ofthe drawer in carrying its load of sand from the hopperand deposit it in the flask. The drawer works from a stationaryplatform, Z, interposed between the hopper and its frame b, whichplatform serves as a bottom for the drawer when its compartmentg isunder the hopper.

The drawer is moved back and forth by means of a return-screw, m,mounted in the frame b and suitably driven. The drawer is connected tothis return-screw by a rod, n., attached to the rear end of the drawerand jointed to a traveler, o, which is supported by flanges p in ways r,attached to the frame b, and this traveler ois provided with aswivelwing, s, which engages the threads of the return-screw to transmitthe motion ot the screw to the traveler.

It will be seen lthat in operation when the binder t is thrown back andthe flask a is in 8o position the rotation of the return-screw willcarry the traveler,and consequently the drawer, toward the flask, andinasmuch as the drawer is in advance of the traveler by the length ol'its compartment g, said compartment will be 8 fully over the flask atthe time the traveler has reached the end of its travel in onedirection, hav-ing reached which the traveler begins its return journey,and-immediately carries the drawer back under the hopper to vreceive afresh charge of sand for auotherflask. It' desi red,automatic stops maybe provided for arresting the drawer both at its forward and returnmovements; butI make no claim to such devices at this time.

In the form shown in Fig. 2 the compartment g of the drawer has amovable bottom,

c, which is supported and travels upon rollers w,xed to the sides of thedrawer. This bottom fv is connected to the rod u, which is op- IOOerated from the returnscrew m through the traveler 0, as in the formerexample, the said bottom being provided with a stop, y, to engage apartition between the compartments g and h of the drawer. The rod o1 isprovided IO5 with a slot, u', of a length equal to the distance betweenthe moldingmachine and hopper. Grooved or other shaped guards,a,preferably of sheet met-al, are interposed between the sides of thecompartment g and the top 5 surface of the bottom t, in order to coverthe joint between the bottom and sides. The guards may be riveted orotherwise attached to the sides of the drawer.

In this form of drawer the engagement of the stop y with the drawercarries the drawer and the bottom in place under the compartmentg overthe flask, the bottom sustaining the load of sand in the compartment.When the drawer covers the flask, the traveler has 5 reached the end ofits forward movement, and begins its return movement,carrying back thebottom and letting the sa'nd drop freely into the flask to fill ituniformly and evenly; but it will be noticed lhat the traveler moves thedistance of the slot n before it is effective in moving` the bottom, sothat when said traveler has reached the end of its return movement thebottom will not be fully retracted, but will cover the space between thehopper and the 5 molding-machine, thus preventingr the loss of sand atthat point. When the flask is filled, the drawer is pushed back in placeunder the hopper by hand, and when the partition between its twocompartments reaches the stop y the bottom will be also carried backwith the drawer, and placed in the position indicated in Fig. 2.

In the form of machine shown in Fig. 2 the bottom serves as or takes theplace of the 5 bridge j in spanning the space between the hopper and themolding-machine.

1n operating sand molding-machines of the character herein referred toit has been found that the face of the sand in the flask, whencompressed, was curved outward to a greater or less degree,notwithstanding the fact that the compressor device and the binder wereperfectly flat. lt hasbeen determined that this resulted from thespringing of the binder, 5 and no amount of sti ffening of the binderhas so far been effective in overcoming this diieulty. I have found byallowing a vent at the upper part of the flask for the escape ofconfined air this objection was overcome. To afford such a vent, I haveprovided the -binder t with projections t at points next to the flask,or such projections may be made upon the flask. YVith this construction,during the process of compressing the confined air makes 5 its waythrough the sand, leaving passages.

which form complete vents for the escape of the gases when the moltenmetal is poured -into the molds in casting.

The binder otherwise is constructed and apf plied to the machinesubstantially as in my Patent No. 332,834.

It is not original with me to automatically .move the sand-drawer of amoldingmachine from thehopper to the flask and back again,

5 and hence my invention in this particular consists in the newcombination of the old returnscrew with the removable drawer,as herein-,weas-await. A

after particularly claimed. Furthermore, the

provision of vent holes in thc binder of a moldingmaehine is notoriginal with me, and with reference to this feature my inventionresides in providing projections at the corners to separate the binderand flask sufficiently to vent the flask. Heretofore, in order to get asquare fit of the binder on the flask, so as to prevent warping andother evil consequences of a bad llt, the meeting parts had to be planeddown level at great cost of time and considerable outlay of money,and'with not always satisfactory results. By using the corner projections I not only vent the flask, but in order to get a square fit ofthe parts have only a few square inches to plane instead of severalsquare feet, and always insure a perfect fit.

Vhat I claim isl. In a sand moldingrmaehine of substantially theconstruction set forth, a sand-hopper and a drawer beneath it forconveying a charge of sand from the hopper to the flask to be filled,combined with means for moving such drawer when filled from the hopperto the flask and returning it to the hopper when its charge has beendeposited in the flask, the same consisting of the return-screw m, thetraveler o, arranged in suitable guides on the frame of the machine andengaging the thread of the return-screw to be traversed back and forththerein, and the rod n, connecting the traveler and drawer to transmitthe motion of the return-screw through the traveler to the drawer,substantially as and for the purpose specified.

2. In a sand molding-machine, a sand-hopper, a sanddrawer arrangedtherein, means to move it to carry the charge of sand to the flask,anda/*movable bottom for said drawer supported on holders attached tothe drawer, and guards secured to the sides ofthe drawer and coveringthe space between the drawer and its bottom, combined substantially asdescribed. f

3. In a sand molding-machine, a sand-hopperA provided with a movabledrawer, an independently-movable bottom for said drawer,

' and a return-screw, combined with a traveler, and a slotted rodconnecting the traveler and bottom, and a stop connecting the drawer andbottom, substantially as and for the purpose described.

4. The combination, in a sand molding-machine, of a flask to receive thecharge of sand, and a binder to cover the flask while molding orcompressing the sand, and projections t', interposed between the flaskand binder, to separate the-two sufficiently to vent the flask while thecompression of the sand is going on, substantially as described.

In testimony whereof I have hereunto set my this 18th day of January, A.D. 1886.

ARTHUR RICE.

XVtIie/sses:

CHARLES H. Gresos,

WM. T.' HALE.

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